I am looking at buying a SS/TC but I have a question...is it susceptible to Direct Injection sludge like most other DI engines? I have read one place that said the LNF doesn't have EGR so if this is the case then it shouldn't sludge up at all.

Has anyone experienced valve/intake runner sludge with the LNF?

 

Regular seafoaming should take care of any build up.

 

its a side-affect of direct injection. its not nescessarily as bad as if egr was implimented, but its kind of the nature of the beast.

 

Carbon buildup on the intake valve stems. Seafoam helps some.

 

so does meth injection =)

 

yes it will sludge some but why do people think seafoaming is so great?

 

Never said it's great, it helps some. Nothing but a toothbrush and time will get the carbon off the valve stems. At 50k miles I had about 1/8" built up around the stems that some Kroil and brushing took off. I seafoamed it twice before that at 20k & 40k. It helps soften & cut some of the carbon when you let it get drawn slowly into the intake manifold.

Meth injection right after the IC would do a better job. Maybe this summer...lol.

 

because it works

 

someone should prove that seafoam actually does help because I'm still skeptical.

and you know this how?

 

not another seafoam discussion... there is no hard evidence that this stuff works and is generally recomended as a last ditch effort to free a valve that is stuck due to carbon buildup.

The recent additives in shell "V power" do a pretty good job at keeping residue buildup to a minimum.

 

exactly

 

Cleaning the valves, pistons and chambers with some sort of top engine cleaner has been a proven repair for decades. Before all these fancy cleaners we used to use just plain water and even that worked pretty good for breaking up carbon in the chambers. Once in a while on the old V8's you'd break loose a piece and it would get stuck on top of the piston for awhile and make a hell of a knocking noise. Scared the cr@p out of me the first time it happened, I thought I broke a piston or spun a bearing it was so loud. Ran some more water through it and took it out and beat on it, piece went through and motor was fine.

Trans fluid also was a common thing to use for top engine cleaning, as was kerosene or diesel fuel. Trans fluid would smoke like crazy though. SeaFoam does work, probably as good as any of the dumbed down environmentally friendly solvents we have now. GM's old "Top Engine Cleaner" was the best until they pretty much killed it. You can still get it but in thimble sized containers.

And yes, LNF's carbon valves, pretty badly. I would top engine clean every 20k or so if you don't have meth. Change oil AFTER cleaning the top end.

 

Wrong. Not on a DI motor.

My post above should eliminate any SeaFoam discussion. It works as well as anything. We don't have many choices since the greeniacs struck.

 

a DI engine isnt like your old v8's. You'd be better off running meth.

 

Shell is false advertising then because according to their web site, they are using detergents to minimize the build-up in DI engines.

Link: Shell V-Power® - United States

 

How is gas going to clean the valves in a DI motor?

 

It wont help on our intake valve. Only the exhaust valve

 

Not gas, detergents. All gas IS created equal, the difference in the stuff you get at the gas stations is the detergents added to the gas. Different detergents = different price, but they all start out with same stuff, then each company adds its own detergents/additives.

 

If the gas (or the detergents in the gas) no longer go though the intake valve to get to the combustion chamber, witch is what DI does, it bypass the intake vavle and shoots the gas directly in the combustion chamber how would gas clean up the backside of the valve?

 

He was pointing to the fact that gas and detergents don't matter because gas doesn't pass over our intake valves. Hence why they gum up. Direct Injection baby.

 

Oh sorry, i got confused.. probably because i never alluded to that or implied it did, merely that it creates less residue post combustion.

 

almost 71k miles... no seafoam or special treatments (although I agree its not a bad idea).... no problems.

Sludge shouldn't be a concern. There's plenty of other reliability issues to keep you busy.

 

when i took the intake off you could still see the bare metal on the intake valves, and i DO run meth.